$justify: (
  start: flex-start,
  center: center,
  end: flex-end,
  between: space-between,
  around: space-around
);

$items: (
  start: flex-start,
  center: center,
  end: flex-end,
  stretch: stretch,
  baseline: baseline
);

@each $class-name, $property-value in $justify {
  .justify-#{$class-name} {
    justify-content: $property-value;
  }
}

@each $class-name, $property-value in $items {
  .items-#{$class-name} {
    align-items: $property-value;
  }
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-1 {
  flex: 1;
}

.flex-center {
  justify-content: center;
  align-items: center;
}
